Variable: org-agenda-hide-tags-regexp
org-agenda-hide-tags-regexp is a customizable variable defined in
org-agenda.el.gz.
Value
nil
Documentation
Regular expression used to filter away specific tags in agenda views.
This means that these tags will be present, but not be shown in the agenda line. Secondary filtering will still work on the hidden tags. Nil means don't hide any tags.
Source Code
;; Defined in /usr/src/emacs/lisp/org/org-agenda.el.gz
(defcustom org-agenda-hide-tags-regexp nil
"Regular expression used to filter away specific tags in agenda views.
This means that these tags will be present, but not be shown in the agenda
line. Secondary filtering will still work on the hidden tags.
Nil means don't hide any tags."
:group 'org-agenda-line-format
:type '(choice
(const :tag "Hide none" nil)
(regexp :tag "Regexp ")))